feat: runtime currency

In this commit, we have made several changes to improve the handling of currencies within the application.

• Added runtime currency support to the 'Handler' class in 'src/QUI/ERP/Currency/Handler.php'. This method provides the ability to get and set the currency during runtime.
• Refactored the 'setUserCurrency' function in 'ajax/setUserCurrency.php'. Removed the use of namespace on every call to 'getAllowedCurrencies' and made it less complex.
• Added a script to extend the header in 'src/QUI/ERP/Currency/EventHandler.php'. The script retrieves the default and runtime currencies.
• Updated 'bin/controls/Switch.js'. Commented out the previous code and added a window location reload call after changing the currency.

These changes ensure that the active user has the correct currency displayed throughout their session.

mentioned in commit 1ae31f35

merged

This MR is included in version 2.2.0

The release is available on GitLab release.

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